st_startpoint

Preview

Support for GEOGRAPHY values is in Public Preview. Support for GEOMETRY values is generally available.

Returns the first point of the input linestring, or None if it doesn't exist.

For the corresponding Databricks SQL function, see st_startpoint function.

Syntax

Python

from pyspark.databricks.sql import functions as dbf

dbf.st_startpoint(col=<col>)

Parameters

Parameter	Type	Description
col	pyspark.sql.Column or str	A Geography or Geometry value representing a linestring.

Parameter	Type	Description
col	pyspark.sql.Column or str	A Geography or Geometry value representing a linestring.

Examples

Python

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('LINESTRING(1 2,3 4,5 6)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_startpoint(dbf.st_geogfromtext('wkt'))).alias('result')).collect()

Output

[Row(result='SRID=4326;POINT(1 2)')]

Python

from pyspark.databricks.sql import functions as dbf
df = spark.createDataFrame([('LINESTRING ZM (1 2 3 4,5 6 7 8)',)], ['wkt'])
df.select(dbf.st_asewkt(dbf.st_startpoint(dbf.st_geomfromtext('wkt', 4326))).alias('result')).collect()

Output

[Row(result='SRID=4326;POINT ZM (1 2 3 4)')]